众所周知,当今在发达国家里,汽车已成为较普遍较重要的交通工具。1986年全世界汽车产量为3611万辆,其中日本1231万辆,美国1068万辆。长期以来,汽车工业一直是美国的支柱工业之一。 据资料介绍,汽车重量减轻100公斤,行驶100公里,省油0.3公斤。对于空载汽车,汽车燃料所做功的80％用于汽车机械系统的能耗 As we all know, cars are now becoming more and more common transportation in the developed countries. In 1986, the global automobile production was 36.11 million, of which 12.31 million were in Japan and 10.68 million in the United States. The automotive industry has long been one of the pillar industries in the United States. According to the information, the car lightened 100 kilograms, driving 100 kilometers, saving 0.3 kilograms. For empty cars, 80% of the work done by automotive fuel is used for energy consumption in automotive mechanical systems